#include <Arduino.h>

class Flasher{
  int ledPin;
  long Ontime;
  long Offtime;


  int ledState;
  unsigned long previousMillis;

  public:
  Flasher(int pin , long on , long off){
    ledPin = pin;
    pinMode(pin , OUTPUT);

    Ontime = on;
    Offtime = off;

    ledState = LOW;
    previousMillis = 0;
  }

  void Update(){
    unsigned long currentMillis = millis();
    if((ledState == HIGH) & (currentMillis - previousMillis >= Offtime)){
      ledState = LOW;
      previousMillis = currentMillis;
      digitalWrite(ledPin , ledState);
    }
    else if((ledState == LOW) & (currentMillis - previousMillis >= Offtime)){
      ledState = HIGH;
      previousMillis = currentMillis;
      digitalWrite(ledPin , ledState);
    }
  }
};

Flasher led1(12, 100, 400);
Flasher led2(13, 350, 350);

void setup(){

}

void loop(){
  led1.Update();
  led2.Update();
}